Returns true
if this is a singular matrix.
Creates a vector from an Array
. The optional second argument specifies whether the array itself or a copy is used internally.
Release code
Removes the last List
.
Completes shortened long style option switch and returns pair of canonical switch and switch descriptor OptionParser::Switch
.
typ
Searching table.
opt
Searching key.
icase
Search case insensitive if true.
pat
Optional pattern for completion.
Returns the number of elements in the match array.
m = /(.)(.)(\d+)(\d)/.match("THX1138.") m.length #=> 5 m.size #=> 5
This says “you can break a line here if necessary”, and a width
-column text sep
is inserted if a line is not broken at the point.
If sep
is not specified, “ ” is used.
If width
is not specified, sep.length
is used. You will have to specify this when sep
is a multibyte character, for example.
Removes an object hierarchy from the data store, by name.
WARNING: This method is only valid in a PStore#transaction
and it cannot be read-only. It will raise PStore::Error
if called at any other time.
Sets default task values
Removes all elements and returns self.
set = Set[1, 'c', :s] #=> #<Set: {1, "c", :s}> set.clear #=> #<Set: {}> set #=> #<Set: {}>
Deletes the given object from the set and returns self. Use subtract
to delete many items at once.
Deletes the given object from the set and returns self. If the object is not in the set, returns nil.
Activates the trace
Return true if trace was enabled. Return false if trace was disabled.
trace.enabled? #=> false trace.enable #=> false (previous state) # trace is enabled trace.enabled? #=> true trace.enable #=> true (previous state) # trace is still enabled
If a block is given, the trace will only be enabled within the scope of the block.
trace.enabled? #=> false trace.enable do trace.enabled? # only enabled for this block end trace.enabled? #=> false
Note: You cannot access event hooks within the block.
trace.enable { p tp.lineno } #=> RuntimeError: access from outside
Deactivates the trace
Return true if trace was enabled. Return false if trace was disabled.
trace.enabled? #=> true trace.disable #=> true (previous status) trace.enabled? #=> false trace.disable #=> false
If a block is given, the trace will only be disable within the scope of the block.
trace.enabled? #=> true trace.disable do trace.enabled? # only disabled for this block end trace.enabled? #=> true
Note: You cannot access event hooks within the block.
trace.disable { p tp.lineno } #=> RuntimeError: access from outside
The current status of the trace
Releases the lock and sleeps timeout
seconds if it is given and non-nil or forever. Raises ThreadError
if mutex
wasn’t locked by the current thread.
When the thread is next woken up, it will attempt to reacquire the lock.
Note that this method can wakeup without explicit Thread#wakeup
call. For example, receiving signal and so on.
Removes all objects from the queue.
Returns the length of the queue.
Removes all objects from the queue.
Returns the length of the queue.